The First Descendant: Ajax Build & Ultimate – Season 4 E1

Welcome to The First Descendant Ajax Build Guide for Season 4 Episode 1.

In this guide, we will explain how to create a powerful build for the Ajax Descendant. We’ll cover how the skills work and which weapons, stats and modules you need to create the most powerful build for Ajax.

Table of Contents:

1. How to play Ajax
2. Ajax Builds Overview – Modules
   1. Ajax Support/Debuffer Build
   2. Ajax Mobbing Build
3. Ajax Trigger Module
4. Ajax Ancestor Modules
5. Arche Tuning for Ajax
6. Ajax Equipment Overview
   1. Best Weapons for Ajax
   2. Best Reactor for Ajax
   3. Best External Components for Ajax
   4. Inversion Reinforcements
7. Ajax Basics
   1. How to unlock Ajax
   2. All Ajax Skills
   3. All Ajax Transcendent Modules
   4. Best Grapple Hook for Ajax
8. Ajax’s Story

For builds on other Descendants, visit our The First Descendant Builds Database, or check out the Character Tier List or the Weapon Tier List. 

TFD Wiki: We have expanded Alcasthq with tfd.gameslantern.com, a Wiki & Database for anything related to The First Descendant. Use the Character Editor or the Weapon Editor to theorycraft and create builds yourself. Browse Descendants, Weapons, Leaderboard Loadouts or use the Compare Tool. There are plenty of other features you can check out, too!

Here is a quick list of the strengths and weaknesses of the Ajax Build for The First Descendant.

How to Play Ajax in the First Descendant

Ajax is a popular support and debuffer Descendant but can also be played as a DPS character.

• With Ajax’s Support/Debuffer Build, he can remove enemy resistances and almost nullify them, increasing the group’s damage tremendously. Additionally, he also buffs the Skill Critical Hit Rate of his group, allowing players to reach 90-100% Skill Critical Hit Rate easily.
• The Ajax Mobbing Build is a weapon-based setup that allows you to shoot rockets pretty much infinitely. As well as any other gun.

Ajax’s Equipment: Make Or Break It!

To unlock Ajax’s full potential, you need the right Weapons, Reactors, and External Components:

• Modules: Selecting the right Modules boosts your character’s power the most; this is very important and changes depending on what build you use.
• Ancestor Modules: Having a good Ancestor module with the right perks is key to maxing out your damage potential.
• Weapons: Ajax doesn’t need an optimized weapon with this setup, you only need one as a stat stick to enhance his skill damage. See the Best Weapons for Ajax section.
• Reactors: Selecting the right reactor stats can drastically improve the build. Check out the Best Reactors for Ajax section.
• External Components: These are critical for survivability. Properly configured, they double or triple your HP and DEF. Learn more in the Best External Components for Ajax section.

Building a top-tier The First Descendant Ajax Build requires not only the right modules but also optimized weapons, reactors, and components.

Best Ajax Builds Overview for The First Descendant

• Crystallization Catalysts: To unlock the necessary socket slots.
• Energy Activator: To increase overall module capacity.
• Gold & Kuiper: Best Gold Farming Method – Best Kuiper Shard Farming Method.

Equipment: I will cover Weapons, Reactors, External Components, Inversion Reinforcements, and Transcendent Modules in the Ajax Equipment section. To maximize the power of any build, you must get the correct items!

Ajax Support and Debuffer Build

This Ajax Support and Debuffer Build is extremely strong. First off, it gives you a huge boost to the group’s Skill Critical Hit Rate, and secondly, it debuffs the enemy’s resistances by a lot. For example, with this build, you can destroy Wall Crasher extremely fast, even if you solo queue, because it will strip the boss’s resistances by a lot, and thus everyone else will deal way more damage.

It is important to reach at least 500k DEF with this setup. You can reach up to 650k depending on how good your Ancestor Module is. 

• 3rd Skill (Enhanced) Buff: 15% Skill Critical Hit Increase [+]. This allows party members to reach 90-100% Crit Hit Rate with the correct builds!
• Battering Ram: Scales of DEF (that is why we want to stack DEF as much as possible), and removes DEF x 25% of enemy resistance. You can nullify some enemy resistances completely.
  • Battering Ram has a short cooldown, you must learn to keep the debuff on the boss all the time!
• Midair Fire Module: Gives you the extra DEF when you are in the air, so keep jumping!
• Divine Punishment Weapon: You must use the Divine Punishment Build for Ajax with this setup to get even more DEF. Preferably 2x so you can swap between them due to the Tactical Change module.
• Ancestor Module: Preferably, you want an Ancestor Module with a high DEF value. So for example go with +DEF +Skill Cooldown – Crit.
• No Ancestor Module? Place Agony Module there instead.

Ajax Mobbing Build

Ajax Trigger Module

You need to first unlock the trigger module slot for each character. Learn how to unlock Trigger Modules in The First Descendant.

• Support & Debuffer: Battering Ram
• Mobbing: Supply Fortress

Ajax Ancestor Module

Ancestor Modules can be slotted once you have acquired them. However, they are only worth it once you have an Ancestor module with good stat rolls on them.

• Ajax Ancestor Module: Guardian’s Resolution
• Superconductive Cooling Units (Needed to Reroll perks): How to farm
• Must Read: How Ancestor Modules Scale & Examples

It is only worth slotting an Ancestor Module if you have good rolls on it; otherwise, it isn’t worth it.

Support/Debuffer Ajax Builds

• Best Rolls
  • DEF
  • Cooldown
• Negative Rolls
  • Skill Critical Hit Rate
  • Skill Critical Hit Damage

Damage Ajax Builds

• Best Rolls
  • DEF
  • Skill Cost
  • Cooldown
• Negative Rolls
  • Dimension Skill Power Boost Ratio
  • Dimension Skill Modifier

Ancestor Module: What to Replace and Why

To slot an Ancestor Module effectively, identify existing modules that share the same primary stat. By replacing a standard module with an Ancestor version that offers similar values, you maintain your core build while gaining its additional unique perks as a ‘free’ bonus.

• How to: Replace a standard module with an Ancestor Module that mirrors its main perk.
  • The values should be close; you preferably don’t want to replace a 100% with a 30% value.
• Example 1: If your Ancestor Module provides Skill Critical Hit Rate, replace Skill Insight.
• Example 2: If your Ancestor Module provides Max HP, replace Increased HP.
• Example 3: If your Ancestor Module provides Skill Effect Range, replace Skill Expansion.
• Result: All other perks from the Ancestor Module will basically be a “freebie” and improve your build!
• Helpful Links:
  • Descendant Synchronization Value Explained
  • Ancestor Module Image & Build Examples
  • Ancestor Module Perk Quality & Stat Scaling Explained

As long as the Ancestor Module reaches a similar value to the one you’re removing, every additional stat on that Ancestor Module becomes a “free” bonus for your build.

Arche Tuning for Ajax

The Arche Tuning System in The First Descendant is important for every Character; it buffs your stats by a good amount.

You level up Arche Tuning in the Sigma Sector Dropoff Operation. Mutant Cells also drop there with a small chance.

Ajax Equipment Overview in The First Descendant

Equipment is the cornerstone of any successful The First Descendant Build. For Ajax, having the right setup can mean the difference between dominating content and falling short. This section breaks down the essential equipment types: Weapons, Reactors, External Components, and Transcendent Modules, and explains how they maximize his power.

Equipment Type	Importance	Key Benefits
Weapons	Only used as a “stat stick” to get extra sprint speed and grapple hook recharge.	Faster movement Skill Damage Enhancement
Reactors	Essential for boosting skill performance. Ajax prefers cooldown and damage perks.	Enhances skill potency. Ensures Ajax’s abilities perform at peak levels.
External Components	Arguably the most impactful equipment. Dramatically improves survivability and utility. Set Buffs with 2/4 pieces.	Quadruples stats like HP or DEF. Adds utility like MP recovery. Enables effective performance in high-difficulty content. Core System Enhancements.
Inversion Reinforcements	Adds further buffs to your build.	Perks that can make a difference in build power.

Best Weapon for the Ajax Build in The First Descendant

Here you will find the Top Weapons for Ajax in The First Descendant that I love to run.

Ajax Support/ Debuffer Build Weapons

Preferably, you want to have two Divine Punishment weapons for the Support/ Debuffer Build. So you can swap between them without losing time on applying the unique ability to get extra DEF. You need to swap weapons to activate the Tactical Master Module to get extra DEF.

Ajax  Support/ Debuffer Build Weapons

Weapon	Category	Key Features	Why It’s Great for Ajax
Divine Punishment	Assault Rifle	Unique Ability increases DEF	Synergizes well with Ajax to get extra DEF.
Divine Punishment	Assault Rifle	Unique Ability increases DEF Duplicate for Tactical Master Module swapping.	Not really needed, but it’s nice to have a second copy to benefit more from the Tactical Master module and not lose time to apply buffs.
N/A	N/A	N/A	N/A

 

Ajax Mobbing Build Weapons

Top 3 Ajax Mobbing  Weapons

Weapon	Category	Key Features	Why It’s Great for Ajax
ATR-0 Prototype	570	Non-Attribute Skill Power Amplification Rate Stat Stick	Boosts all skill damage.
Restored Relic	Launcher	Guided Rounds Cluster Bombs	This is a powerful rocket launcher that fires guided rounds that explode into clusters to hit even more enemies! Great because we have infinite ammo! Must have 3x Fire Rate Cores at 20%
The Last Dagger	Handgun	Burst Single Target DPS	One of the most powerful Single-Target Burst Weapons. Great to nuke mini-bosses.
Perforator	Hand Cannon	Amazing Single Target DPS	Crazy Single Target DPS, must be able to hit weak spots of enemy!

Other Useful Weapons

Other Useful Weapon Options for Ajax

Weapon	Category	Key Features	Why It’s Great for Ajax
Exterminator	Rocket Launcher	Easily destroys enemy Assault Ships. Easily destroys enemy Swarm Sacks & Tunnels. Auto Target function when aiming.	Weapon specialized in destroying Assault Ships, Swarm Sacks & Tunnels.
Shadow	Sword	Massive AoE & ST damage. Strong Special AoE skill.	Best allrounder Sword for massive damage. Fast movement.
Thunder Cage	Submachine Gun	Everyone has this weapon from the main story (easily accessible). “Newbies’ Best Friend” Rains down thunder on enemies.	Deals great AoE damage. Overall good performance.

Best Reactor for Ajax in The First Descendant

Selecting the best reactor for Ajax in The First Descendant can significantly enhance his abilities, allowing you to maximize his effectiveness in various scenarios. Not only does the reactor determine your skill damage, but it also gives additional secondary benefits through modifiers.

How to find the Location of Reactors

Reactor drop locations change every day. Not many players know this and get confused. Now, there is a reactor search function in-game. Go to the map and press on Difficulty Level Rewards. In here, you can see where all the reactors currently drop.

Note: It is possible that not all reactor types are currently dropping. You have to come back and recheck every day.

If your specified reactor drops in an area, you go there and farm any missions and monsters (Preferably missions with lots of monster spawns). There will be plenty of reactors dropping from monsters all over the place, any monster works. It will take a while to get a good reactor!

Best External Components for the Ajax Build

Here is the best external component set that you want to run with Ajax:

• Ajax Support/ Debuffer Build: 2x Moving Fortress, 1x Bravery, 1x Supernova
• Ajax Mobbing Setup: 2x Moving Fortress, 2x Shell Crusher

Important substats that you want for the components, these are locked per component types:

Ajax Support/ Debuffer Build

Note: We use 2x Moving Fortress, 1x Bravery and 1x Supernova to get as much DEF as we can, not for the set effect.

• Moving Fortress Auxiliary Power: MP Recovery Out of Combat & Max HP
• Bravery Sensor: Max MP & MP Recovery in Combat
• Moving Fortress Memory: MP Recovery Modifier & DEF
• Supernova Processor: Max Shield, Shield Recovery Modifier

Ajax Mobbing Build

• Moving Fortress Auxiliary Power: MP Recovery Out of Combat & Max HP
• Shell Crusher Sensor: Max MP & MP Recovery in Combat
• Moving Fortress Memory: MP Recovery Modifier & DEF
• Shell Crusher Processor: Max Shield, Shield Recovery Modifier

External Component Cores: Always go with Max HP & DEF.

Inversion Reinforcements Setup for Ajax

You can find the Inversion Reinforcements in the inventory, located on the bottom left side. This changes with every new season and needs to be leveled up again.

At max level, you have unlocked everything. While the last perk is always active in each row, you can only slot three additional perks at the bottom. Here is what you want to prioritize:

Ajax Support/ Debuffer Build

• Skill: Perk 3.
• Weapon: None.
• Recovery: Perk 1.
• Survival: Perk 2.
• Season: None.

Ajax Mobbing Build

• Skill: Perk 1.
• Weapon: None.
• Recovery: Perk 1.
• Survival: Perk 2.
• Season: None.

Ajax Basics in The First Descendant

If it is your first time playing Ajax in The First Descendant, here are some useful things you should know.

1. How to unlock Ajax
2. All Ajax Skills
3. All Ajax Transcendent Modules
4. Best Grapple Hook for Ajax

How to Get Ajax in The First Descendant

Let’s take a quick look at how to unlock Ajax in the First Descendant. To unlock Ajax, you have to select him in the tutorial, purchase him from the store, or research him. You need the following items to research Ajax:

• 1x Ajax Enhanced Cells
  • Archive Shard
• 1x Ajax Stabilizer
  • Archive Shard
• 1x Ajax Spiral Catalyst
  • Archive Shard
• 1x Ajax Code
  • Archive Shard
• 400k Credits

When you visit Magisters Anais at the Research Institute you can hover over each item. Then click on Acquisition Info and it will tell you where this specific item drops. You can also view our in-depth guide on How to unlock Ajax in The First Descendant.

Ultimate Ajax: How to unlock Ultimate Ajax in The First Descendant

The First Descendant Ajax Skills Explained

In this section, we are going to explain the skills available to our Ajax Build in the First Descendant, how each skill works and the best ways for you to use them.

Icon	Skill Name	Description
	Orbit Barrier	Creates a shield in front of Ajax. Durability increases proportionally to Ajax’s HP and DEF. *If enhanced, reflects damage proportional to DEF to enemies hitting the barrier.
	Void Walk	Leaps into the air and lands on the ground to strike nearby enemies, stunning them. *If enhanced, Max Shield increases for a certain period of time.
	Expulsion	Strikes nearby enemies, knocking them back. *If enhanced, knockback range and Max Shield are increased.
	Hyper Cube	Creates a dome-shaped shield. Durability increases proportionally to Ajax’s HP and DEF *If enhanced, reflects damage proportional to DEF to enemies hitting the barrier.
	Event Horizon (Passive)	The ability to store Void Energy during battle. Void Energy can be used to enhance skills with additional effects.

Orbit Barrier

Void Walk

Expulsion

Hyper Cube

Event Horizon (Passive)

All Ajax Transcendent Modules

Ajax has the following transcendent modules:

• Void Explosion
• Void Charge
• Matrix Recomputation
• Body Enhancement
• Mobile Fortress Barrier
• Void Barrier

Smooth Grapple Hook for your Ajax Build

Using the standard Grapple Hook in The First Descendant can be a pain, and it feels kinda frustrating at times. Don’t worry, there is a way better alternative that will make it a joy to use the grappling hook!

It is called the Mid-Air Maneuvering Sub Module. I use this on all my The First Descendant Builds because it improves grappling by so much.

With this Module, you can attach your Grapple Hook to anything, even air! That means you can simply aim towards the sky and Hook up your grapple hook there for guaranteed fast movement!

Here is a guide on how to get the Mid-Air Maneuvering Sub Module in The First Descendant. It won’t take a lot of effort, but it will improve your build and overall gameplay in The First Descendant.

Ajax’s Story in The First Descendant

A tanker-type dealer who utilizes Void Energy. Coordinates his team with a forcefield that protects allies while deflecting enemy attacks. 

Ajax was a Descendant who left active duty to fulfil his longtime desire to become a professor at the Albion Military Academy. But on his first day at the job, he regretted his decision. This was because a voice recording was forwarded to him, containing an urgent request for assistance from Aisha, his former comrade-in-arms. The mission that Aisha had been deployed to was a reconnaissance-in-force deep into the Void. If he hadn’t retired, Ajax himself would’ve been sent on that mission.

Eventually, Ajax donned the Raley Mk.5 Battlesuit, a piece of equipment used exclusively for Void exploration, which was still a work in progress at the time, and set out to find Aisha. Since ten squads of Descendants on active duty couldn’t have stopped him anyway, taking out the equipment and launching into the Void was easy.

However, finding Aisha’s squad in the depths of the Void would prove to be a difficult mission, even for this powerful Descendant. To make matters worse, the suit that should have shielded him from the Void’s environment malfunctioned, absorbing Void Energy. This caused Ajax, who was barely holding on in continuing the search, to collapse in the end.

Just as he was about to give up on everything, something unexpected happened. Aisha’s form emerged from the Void storm and enveloped Ajax, while simultaneously triggering the return protocol. In an instant, Ajax dropped down to the center of the Descendant’s zone, and everyone acted as if they were seeing a ghost. As it turned out, what seemed like a few days spent in the depths of the Void turned out to be a decade passed in Ingris.

When the situation settled down, Alpha visited Ajax and tore up his casualty listing, consoling him. He told Ajax that since he was now free of death and the Void, he had prepared documents for him to return to teaching. But Ajax ripped up the papers Alpha handed him and declared his desire to return to the Descendant Corps. For it was only his physical body that was freed; his mission to protect his teammates was far from over.

Related Guides for The First Descendant

You can also check out our Ultimate Weapons Database for The First Descendant or the Builds Database for The First Descendant.